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Tanaka R, Yamaoka S, Ikeda S, Okano K, Horie M, Minami H, Suzuki N, Mori A. High-Intensity Circular Dichroism of Head-To-Tail Regioregular Poly(1,4-Phenylene)s in the Aggregated State. Chemistry 2024; 30:e202400706. [PMID: 38647089 DOI: 10.1002/chem.202400706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 04/17/2024] [Accepted: 04/22/2024] [Indexed: 04/25/2024]
Abstract
Circular dichroism (CD) studies on poly(1,4-phenylene)s bearing a chiral side chain in the aggregated conditions were carried out. Little CD was observed in a solution form, while addition of a poor solvent into the polyphenylene solution induced aggregation and a strong CD was observed, accordingly. Applying the controlled degree of polymerization (DP) of poly(1,4-phenylene) in the use of bidentate diphosphine Chiraphos as a ligand for the nickel catalyst, the relationship of DP with CD strength was studied to reveal to show the highest CD at the DP=84 (gabs=ca. 2×10-2). It was also found that the related aggregation was observed in good solvent 1,2-dichloroethane upon standing the solution at 4 °C for 3-23 days to observe gabs=ca. 10-1. Studies on the substituent effect of poly(1,4-phenylene) suggested that CD behaviors were dependent on the type of non-chiral substituent on the aromatic ring as well as the side-chain chirality.
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Affiliation(s)
- Rikuya Tanaka
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, 657-8501, Kobe, Japan
| | - Seiha Yamaoka
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, 657-8501, Kobe, Japan
| | - Shuichi Ikeda
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, 657-8501, Kobe, Japan
| | - Kentaro Okano
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, 657-8501, Kobe, Japan
| | - Masaki Horie
- Department of Chemical Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, 30013, Hsinchu, Taiwan
| | - Hideto Minami
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, 657-8501, Kobe, Japan
| | - Nozomu Suzuki
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, 657-8501, Kobe, Japan
| | - Atsunori Mori
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, 657-8501, Kobe, Japan
- Research Center for Membrane and Film Technology, Kobe University, 1-1 Rokkodai, Nada, 657-8501, Kobe, Japan
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Suzuki N, Fujiki M, Kimpinde-Kalunga R, Koe JR. Chiroptical Inversion in Helical Si–Si Bond Polymer Aggregates. J Am Chem Soc 2013; 135:13073-9. [DOI: 10.1021/ja405570q] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nozomu Suzuki
- Graduate School of Materials
Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
| | - Michiya Fujiki
- Graduate School of Materials
Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
| | - Ruth Kimpinde-Kalunga
- Department of Material Science, International Christian University, 3-10-2 Osawa, Mitaka,
Tokyo, 181-8585, Japan
| | - Julian R. Koe
- Department of Material Science, International Christian University, 3-10-2 Osawa, Mitaka,
Tokyo, 181-8585, Japan
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Sanada Y, Sato T. Induced circular dichroism of an optically active polyfluorene derivative in phase-separating solutions. Polym J 2009. [DOI: 10.1038/pj.2009.330] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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